I need to drill a couple of holes (cavity wall) from the loft gable
end to outside to pass cables through.

I decided it would be neater, easier and better to drill a 25mm hole,
slightly angled so it doesn't "rain in" and fit a piece a pvc tubing
(to prevent the cable chafing on the entry and exit) rather than drill
a number of small holes (one for each cable).

I have a set of long masonry bits that go up to 12mm so a can start
with those.

I thought it would be easy to find a long 25mm bit. It was. One such
beast is a Rawlplug 32-350 at 35mm x 300mm but I can't find any
website that specifies the shank diameter.

I could email/phone a supplier but I thought I'd just ask here on the
off chance one of you has such a drill and can tell me.

TIA

Barry
--
The easiest thing to grow in a garden is tired.